Jami` at-Tirmidhi, Book 24, Hadith 60 (In-Book) ⓘ
Narrated Qatadah: "I asked Anas bin Malik: 'How were the sandals of the Messenger of Allah ? He said: 'They had two straps.'"
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا أَبُو دَاوُدَ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ قُلْتُ لأَنَسِ بْنِ مَالِكٍ كَيْفَ كَانَ نَعْلُ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ لَهُمَا قِبَالاَنِ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
also referenced under: Hadith 1772 (Reference) & Volume 3, Book 22, Hadith 1772 (DarusSalam)